CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current Assets:
Cash and Cash Equivalents	$ 32,482	$ 72,108
Marketable Securities	187,646	217,781
Accounts and Other Receivables	1,116	970
Prepaid and Other Current Assets	7,538	4,077
Total Current Assets	228,782	294,936
Property and Equipment, Net	11,293	11,461
Intangible Assets, Net	20,287	20,794
Other Assets	1,879	1,428
Goodwill	8,965	8,965
Total Assets	271,206	337,584
Current Liabilities:
Accounts Payable	706	1,506
Accrued Expenses	14,937	24,316
Current Portion of Long-Term Liabilities	4,360	4,418
Total Current Liabilities	20,003	30,240
Other Long-Term Liabilities	16,494	17,239
Total Liabilities	36,497	47,479
Commitments and Contingent Liabilities
Stockholders' Equity:
Convertible Preferred Stock, $.01 Par Value; 3,000,000 Shares Authorized; No Shares Issued and Outstanding at June 30, 2016 and December 31, 2015
Common Stock, $.001 Par Value; 297,000,000 Shares Authorized; 99,394,537 and 98,685,595 Shares Issued and Outstanding at June 30, 2016 and December 31, 2015, respectively	99	99
Additional Paid-In Capital	889,468	878,655
Accumulated Other Comprehensive Income	2,723	2,307
Accumulated Deficit	(657,581)	(590,956)
Total Stockholders' Equity	234,709	290,105
Total Liabilities and Stockholders' Equity	$ 271,206	$ 337,584